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Günterblassite

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Formula:
(K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O ·
Also given as (K,Ca,Ba,Na◻)3Fe[(Si,Al)13O25(OH,O)4].7H2O
System:
Orthorhombic
Colour:
colorless, white, pale ...
Hardness:
4
Name:
Named after Günter Blaß, amateur mineralogist from Germany, who has studied minerals from the Eifel area in detail.
Related to umbrianite and hillesheimite.

Classification of Günterblassite

Approved
Approval Year:
2011
mindat.org URL:
http://www.mindat.org/min-41771.html
Please feel free to link to this page.

Type Occurrence of Günterblassite

General Appearance of Type Material:
flattened from thin lamellar to tabular crystals up to 0.2 × 1 × 1.5 mm in size and their nea-rparallel or sheaf-shaped aggregates up to 3 mm across.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia with the registration number 4107/1.
Geological Setting of Type Material:
alkalai basalts

Physical Properties of Günterblassite

Diaphaneity (Transparency):
Transparent
Colour:
colorless, white, pale yellow, or brown
Streak:
white
Hardness (Mohs):
4
Tenacity:
Brittle
Cleavage:
Perfect
perfect cleavage is parallel to (001) and less perfect, to (100) and (010).
Density:
2.18(1) g/cm3 (Measured)    2.17 g/cm3 (Calculated)

Crystallography of Günterblassite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 6.528(1) Å, b = 6.970(1) Å, c = 37.216(5) Å
Ratio:
a:b:c = 0.937 : 1 : 5.339
Unit Cell Volume:
V 1,693.33 ų (Calculated from Unit Cell)
Z:
2
Comment:
Pnm21

Optical Data of Günterblassite

Type:
Biaxial (+)
RI values:
nα = 1.488(2) nβ = 1.490(2) nγ = 1.493(2)
2V:
Measured: 80° (5), Calculated: 79°
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none

Chemical Properties of Günterblassite

Formula:
(K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O ·

Also given as (K,Ca,Ba,Na◻)3Fe[(Si,Al)13O25(OH,O)4].7H2O
All elements listed in formula:

Other Names for Günterblassite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Günterblassite

Reference List:
Chukanov, N.V., Rastsvetaeva, R.K., Aksenov, S.M., Pekov, I.V., Zubkova, N.V., Britvin, S.N., Belakovskiy, D.I., Schueller, W., Ternes, B. (2012): Günterblassite, (K,Ca)3−xFe[(Si,Al)13O25(OH,O)4] • 7H2O, a new mineral: the first phyllosilicate with triple tetrahedral layer. Geology of Ore Deposits 54, 656-662.

Rastsvetaeva, R.K., Aksenova, S.M., Chukanov, N.V. (2012): Crystal structure of günterblassite, a new mineral with a triple tetrahedral layer. Doklady Chemistry, 442, 57-62.

Internet Links for Günterblassite

Localities for Günterblassite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany (TL)
 
  • Rhineland-Palatinate
    • Eifel
      • Gerolstein
        • Roth
Rastsvetaeva, R.K., Aksenova, S.M., Chukanov, N.V. (2012): Crystal structure of günterblassite, a new mineral with a triple tetrahedral layer. Doklady Chemistry, 442, 57-62; Chukanov, N.V., Rastsvetaeva, R.K., Aksenov, S.M., Pekov, I.V., Zubkova, N.V., Britvin, S.N., Belakovskiy, D.I., Schueller, W., Ternes, B. (2012): Günterblassite, (K,Ca)3−xFe[(Si,Al)13O25(OH,O)4] • 7H2O, a new mineral: the first phyllosilicate with triple tetrahedral layer. Geology of Ore Deposits 54, 656-662. ; Blaß, G. & Schüller, W. (2012): Der Rother Kopf in der Vulkaneifel. Lapis, 37 (3), 20-29.; Aksenov, S. M., Rastsvetaeva, R. K., & Chukanov, N. V. (2014). The crystal structure of emmerichite Ва 2Na 3Fe 3+ Ti 2 (Si 2O 7) 2O 2F 2, a new lamprophyllite-group mineral. Zeitschrift für Kristallographie–Crystalline Materials, 229(1), 1-7.
      • Hillesheim
Marcus Voigt Collection
Mineral and/or Locality  
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